Laminated bucket



H. D. HALEY May 28, 1946.

LAMINATED BUCKET Filed March 16, 1944 lllll' 16 i1 115? 3155 3 ATTORNEYPatented May 1946 UNITED STATES PATENT OFFICE A LAMINATED BUCKET 7 Hugh1). Haley, Drexel Hill, Pa., assignor to Amerloan Vllcose Corporation,Wilmington, Del, a corporation of Delaware I Application March 16, 1944,Serial No. 525,691

' 9Claiins. (our-1s),

This invention relates to spinning buckets such as are used in themanufacture of artificial filamentary material, or the like.

The spinning bucket which, in-the manufacture of rayon, is used fortwisting the fibers and coiling them in the form of a cake as they comefrom the setting medium, is provided with a cover ledge and a groove fora cover-retaining ring, the provision of which necessitates the removalof some material from the'bucket. To compensate for such removal ofmaterial, it is necessary to build up the outside diameter of the bucketat its upper rim. Such displacement of the material at of the bucketwall results in the rim being sub- Ject to greater centrifugal force,and therefore to greater stresses and strains, than th rest of thebucket.

Under such excessive centrifugal force the rim the rim outwardly withrespect to the remainder at the top and undue stress is exerted on thefilamentary material at that point.

It has been suggested to reinforce the rim of spinning buckets byplacing a steel band thereabout. Such metallic reinforcements do notadhere to the rim when the bucket is rotated at high speeds, but tend toseparate or work loose therefrom. The reinforcement afforded the rim bysuch means is therefore merely temporary.

Buckets having wire windings imbedded inor wrapped about'the outsidesurface of the side walls thereof have also been suggested but in thatcase as well the wire windings work loose from the buckets underconditions of use commonly encountered in spinning artificialfilamentary material, that is, high speeds of rotation and, furthermore,do not reinforce the bucket at its most critical point, which is theupper peripheral edge or rim. Such buckets have the additionaldisadvantages that the provision ofthe wire windings about the outsidesurface'thereof necessitates the machining of grooves therein be coveredwith a protective wrapping of lamihated cloth, in order to shield themagainst acid attack, and thus the initial cost of the buckets isrendered unduly high and, since the wire windings increase the weight ofthe bucket, increased power is required for high speed rotation thereof.Buckets consisting entirely of resin-impregnated laminated fabric, andwhich are naturally more resistant to cracking or breaking, are notunknown, but the costs involved in producing such buckets arecomparatively exorbitant and prohibit the adoption thereof for use on alarge scale. v

I have now found that it is unnecessary to depend upon the substantiallyineffective expedient of providing any part of the spinning bucket withmetallic reinforcements or to resort to theme of laminated material forthe entire bucket structure, in order to provide a bucket which iscapable of being, rotated at extremely high speeds for prolonged periodswithout breakage or deformarim about its upper peripheral edge which ismolded from a. resin-impregnated laminated material/ The rim of thebucket is thus permanently and uniformly reinforced throughout itsentirety and is capable of withstandingfor pra'ctically indefiniteperiods the stresses and strains created by the high centrifugal forceto which the rim is'subjected when thebucket is in use.

The reinforced rim is also highly resistant to chipping such as may beincurred when the buckets are doffed to permit the cake of filamentarymaterial to drop therefrom.

In addition, the costs involved in providing the bucket with thespecially constructed rim portion compare favor ably with the costs 7 ofmanufacturing conventional molded spinning buckets and are, of course,considerably less than the costs of manufacturing buckets consistingentirely of laminated material.

In the accompanying drawing,

Figure 1 is a front elevation of a preferred embodiment of theinvention; and

Figures 2 and 3'illustrate various modifications of the 'rim for aspinning bucket in accordance with the invention. 7

Referring to Figure 1, the spinning bucket comprises a'rim I. acylindrical side wall 2, and

to accommodate the wire, and the wire must then B disposed therein, formounting the bucket upon 2 I l a rotating shaft or spindle during use,the grooves serving to maintain the bushing in place during rotation ofthe bucket. Annular roove 1 for seating a retaining ring to hold theusual cover in place, and an annular shoulder 8 for seating stancecotton, wool, regenerated cellulose, cellulose derivatives, mixtures .ofsuch fibers, or glass fibers bonded together with the aid of a phenolicconsist of natural or artificial fibers, as for incresol or other resin,preferably the same resin as that used in molding the body of thebucket.

Since the annular groove I and shoulder 8 are.

provided in the main body of the bucket, provision thereof does notnecessitate the waste of expensive laminated material, which is onlyrequired for the extreme peripheral rim or edge of the bucket. In thefinished structure, the body portion and rim are intimately moldedtogether to form a smooth unitary structure.

The rim portion or collar for the bucket may be preformed by firstwinding a resin-impregnated fibrous material upon itself to form anannulus, and then heating and pressing the material to form the 'desiredshape, the pre-forming operation being carried out under such conditionsthat the material takes the desired shape but is not completely cured.Afte the rim has been pre-molded, the phenol-formaldehyde resin powderis placed in the mold for molding the body portion of the bucket, andthe partially cured laminated rim i tapped in place over the powder inthe mold, after which the two are molded until they are cured andhardened into the finished unitary spinning bucket. The body and rimportion may be molded together under heat and pressure according to. anyconventional method, or they may be heated to molding temperature in ahigh frequency electric current and then immediately transferred to abox mold and subjected to a regular molding operation. Thelast-mentioned molding method has the advantage that the curing andmolding cycle is greatly accelerated and lower pressures are equired.

' The rim may be of any desired shape, as shown,

it overhangs the side wall of the main body portion of the bucket andpartially extends into the wall.

In the finished spinning bucket, the molded resin-impregnated laminatedfabricis disposed in circles which are roughly concentric with thebucket rim, so that the rim is uniformly rein forced throughoutitsentirety, and constitutes an integral part of the cylindrical sidewall of the spinning bucket, to form a unitary structure of greatinherent strength. The exterior and interior surfaces of the completedbucket are smooth, which is advantageous in the collection offilamentary material.

tion, the resin of the body and the resin of the rim being integrallymolded together to form, a

continuous mass, and the resin only being fabricreinforced.

2. A molded spinning bucket comprising a bottom wall having an integralhub, and a substantially cylindrical side wall extending upwardly fromsaid-bottom wall, said hub and bottom and side wall-being formed of anartificialresin, and a rim aboutthe upper peripheral edge of said sidewall formed or a resin-impregnated laminated fabric disposed incircleswhich are generally concentric with the bucket rim, the resin ofthe side wall and the resin of the rim being integrally molded togetherto form a continuous mass the rim only being fabric-reinforced.

3. A molded spinning bucket comprising a. bottom wall having an integralhub, and a substantially cylindrical side wall extending, upwardly fromsaid bottom wall, said hub and bottom and side wall being formed of anartificial resin, and a rim about the upper peripheral edge of said sidewall and overhanging the latter, said rim being formed of aresin-impregnated laminated laminated fabric disposed in circles, whichare generally concentric with the bucket rim, said rim being integrallymolded to said 'side wall by an artificial resin, the resin of the sidewall and the resin of the rim being integrally molded together to form acontinuous mass the rim only being fabric-reinforced.

5. A molded spinning bucket comprising a bottom wall having an integralgrooved hub and a substantially cylindrical side wall extending upwardlyfrom said bottom wall, said hub and hottom and side wall consisting ofan artificial resinous material, and a rim about the upper peripheraledge of said side Wall and overhanging and at least partially extendinginto said wall, consisting of a resin-impregnated laminated fabricdisposed in circles which are generally concentric with the bucket rim,said rim being integrally molded to said side wall by an artificialresin, the resin of the side wall and the resin of the rim beingintegrally molded together to form a continuous mass the rim only beingfabricreinforced.

6. A molded spinning bucket comprising a bot-- tom wall having anintegral hub, and asubstan- While a preferred embodiment of the inven-'tion has been disclosed, "the description is intended to .be,illustrative only, and it is to be understood that changes and variationmay be made without departing from the spirit and scopetiallycylindrical' sidewall extending upwardly from said bottom wall,said hub and bottom and side walls being formed of a phenol-formaldehyderesin, and a rim molded to the upper peripheral edge of said side wall,in intimate association therewith, said rim being formed 'of a laminatedfabric impregnated with a phenol-formaldehyde resin, the resin of theside wall and the resin of the rim being integrally molded together toform a continuous mass the rim only being fabric reinforced.

7. A molded spinning bucket having a main resin of'the rim beingintegrally molded together to form a continuous mass the rim only beingfabric-reinforced.

9. A molded spinning bucket having a; substantially cylindrical sidewall of a. molded artificial formed of a laminated phenol-formaldehydeor resin, a'rim about the upper portion of the said side wall integrallymolded therewith and formed of a resin-impregnated laminatedfabricdisposed in circles which are generally concentric with the bucket rim,the resin of the side wall and the resin of the rim being integrallymolded together to form a. continuous mass, the rim only beingfabric-reinforced.

HUGH D. HALEY,

. 3 crescl formaldehyde resin impregnatedfabric disposed in circleswhich are generally concentric with the rim, the resin of the side walland the t

